calculators · Updated 21 Jul 2026
Fair Odds Calculator
Type in any 1X2 book — the calculator shows the bookmaker's margin, the market's fair probabilities (power method, the one Tofiko uses product-wide), and the fair odds each outcome would deserve without the fee.
| Outcome | Raw 1 ÷ odds | Naive (proportional) | Fair (power) | Fair odds |
|---|---|---|---|---|
| Home | 50.0% | 48.4% | 48.9% | 2.04 |
| Draw | 29.4% | 28.5% | 28.3% | 3.53 |
| Away | 23.8% | 23.1% | 22.8% | 4.39 |
Power = the margin-removal method Tofiko uses everywhere (validated on 43,000+ closing books). It takes proportionally more off longshots, matching how bookmakers actually load the margin.
How to read the result
- Raw 1 ÷ odds — the naive reading of each price. These sum to more than 100%; the excess is the margin. Treating these as probabilities makes every outcome look more likely than the market believes.
- Naive (proportional) — the margin scaled out equally. Better, but it leaves longshots overstated, because bookmakers don't spread the fee equally.
- Fair (power) — the margin removed by solving for an exponent instead of dividing. This takes proportionally more off the outsiders, which is where the fee actually hides. Why this method won our validation →
- Fair odds — 1 ÷ fair probability: the break-even price. If you can consistently beat these numbers, you have real judgement; beating the raw ones only means you've noticed the fee exists.
What to do with fair odds
Compare your own probability estimate (or a model's) against the fair column, never the raw one. The gap between your number and the fair number is your claimed edge — and to profit after the fee, your bet's quoted odds must still exceed 1 ÷ your probability (see Expected Value).
This is exactly the math behind every "Market %" figure on Tofiko match pages, and the benchmark our models are graded against weekly on the Performance page.
Related
Frequently asked questions
What are fair odds?
The odds a match would trade at if the bookmaker charged no fee — computed by removing the margin from the quoted prices so the implied probabilities sum to exactly 100%. Fair odds are always higher than the quoted ones.
Why do the naive and power methods give different fair probabilities?
The naive method scales all outcomes down equally; the power method takes proportionally more off longshots. Real books load more margin onto longshots (the favourite-longshot bias), so the power answer matches actual results better — in our 43,000-book test, power-method longshot probabilities matched their real win rate exactly while the naive method overstated them.
How big is a typical football margin?
Top leagues usually run 5–8%; lower divisions and live markets can exceed 10%. The margin is the minimum edge your judgement must overcome before a bet can be profitable.